Обсуждение: help needed for functions

CREATE TABLE department(id int primary key, name text);

CREATE TABLE employee(id int primary key, name text, salary int, departmentid int references department);

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INSERT INTO department values (1, 'Management');

INSERT INTO department values (2, 'IT');

INSERT INTO employee values (1, 'John Smith', 30000, 1);

INSERT INTO employee values (2, 'Jane Doe', 50000, 1);

INSERT INTO employee values (3, 'Jack Jackson', 60000, 2);

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CREATE OR REPLACE FUNCTION GetEmployees()

RETURNS SETOF employee

AS

          'select * from employee;'

LANGUAGE 'sql';

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CREATE TYPE HOLDER AS (departmentid int, totalsalary int8);

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CREATE or replace FUNCTION SqlDepartmentSalaries()

RETURNS SETOF holder

AS

'

    select departmentid, sum(salary) as totalsalary from GetEmployees() as a group by departmentid

'

LANGUAGE 'sql';

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select * from SqlDepartmentSalaries();

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--We can do the same in PLPGSQL in this way.

CREATE OR REPLACE FUNCTION PLpgSQLDepartmentSalaries()

RETURNS SETOF holder

AS

'

DECLARE

    r holder%rowtype;

BEGIN

    FOR r in select departmentid, sum(salary) as totalsalary from GetEmployees() group by departmentid

    LOOP

        return next r;

    END LOOP;

    RETURN;

END

'

LANGUAGE 'plpgsql';

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Thanks
Dinesh Pandey

From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Nitin Ahire
Sent: Friday, September 16, 2005 7:21 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] help needed for functions

Hello All,

I am new to postgresql database.

I am transferring current database from mssql database to postgresql 7.4

I am facing problems for stored procedures. Is their any way so that I can transfer my existing stored procedure from mssql to postgre ?

I already read about functions & tried to implement it but I could not found any way to get multiple columns from a function.

Also I would like to get help about selecting values from two tables using function.

Thanks

Nitin